A ragged porous hollow tubular carbon nitride towards boosting visible-light photocatalytic hydrogen production in water and seawater

Guo, Feng; Chen, Zhihao; Shi, Yan; Cao, Longwen; Cheng, Xiaofang; Shi, Weilong; Chen, Lizhuang; Lin, Xue

doi:10.1016/j.renene.2022.01.107

Cited by 76 publications

(17 citation statements)

References 87 publications

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“…Therefore, the electrons accumulated on the CB of g-C 3 N 4 reduced the adsorbed CO 2 to form CO. Last but not least, abundant CDs can also act as efficient holes reservoir to collect more holes from Bi clusters and the VB of g-C 3 N 4 . [62][63][64] What we cannot ignore is that although the ultrasmall Bi clusters are anchored on the surface of CDs, it inevitably results in the binding of CDs and g-C 3 N 4 . Consequently, built-in electric fields are formed at the interfaces of Bi-CDs and g-C 3 N 4 -CDs, respectively, in which a positive space charge region, an electron barrier layer, is formed on the surface of Bi clusters and g-C 3 N 4 nanomeshes.…”

Section: Resultsmentioning

confidence: 99%

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C₃N₄ Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO₂

Zhao

Kong

et al. 2022

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Synthesis of high‐efficiency, cost‐effective, and stable photocatalysts has long been a priority for sustainable photocatalytic CO2 reduction reactions (CRR), given its importance in achieving carbon neutrality goals under the new development philosophy. Fundamentally, the sluggish interface charge transportation and poor selectivity of products remain a challenge in the CRR progress. Herein, this work unveils a synergistic effect between high‐density monodispersed Bi/carbon dots (CDs) and ultrathin graphite phase carbon nitride (g‐C3N4) nanomeshes for plasma‐assisted photocatalytic CRR. The optimal g‐C3N4/Bi/CDs heterojunction displays a high selectivity of 98% for CO production with a yield up to 22.7 µmol g−1 without any sacrificial agent. The in situ confined growth of plasmonic Bi clusters favors the production of more hot carriers and improves the conductivity of g‐C3N4. Meanwhile, a built‐in electric field driving force modulates the directional injection photogenerated holes from plasmonic Bi clusters and g‐C3N4 photosensitive units to adjacent CDs reservoirs, thus promoting the rapid separation and oriented transfer in the CRR process. This work sheds light on the mechanism of plasma‐assisted photocatalytic CRR and provides a pathway for designing highly efficient plasma‐involved photocatalysts.

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Section: Resultsmentioning

confidence: 99%

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C₃N₄ Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO₂

Zhao

Kong

et al. 2022

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“…The time-resolved PL spectra of gCN and gCN-FePc-1 also were examined (Figure 4c), and the fluorescence lifetimes were calculated to be 3.92 ns for gCN and 2.67 ns for gCN-FePc-1. The decrease in time-resolved PL lifetime indicated a more effective conversion of singlet exciton in the photocatalyst and charge transfer kinetics [47,48].…”

Section: Optical Propertiesmentioning

confidence: 99%

Covalent Modification of Iron Phthalocyanine into Skeleton of Graphitic Carbon Nitride and Its Visible-Light-Driven Photocatalytic Reduction of Nitroaromatic Compounds

et al. 2022

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It is of great urgency to eliminate nitroaromatic compounds (NACs) in wastewater due to their high residue and toxicity. Photocatalysis reduction is considered to be an efficient technology for converting NACs to their corresponding aromatic amines. In this work, a visible-light-driven hybrid photocatalyst was synthesized by covalently doping Fe phthalocyanine (FePc) into graphitic carbon nitride skeleton. Compared to the pristine gCN, the optimized gCN-FePc-1 photocatalyst showed enhanced absorption in visible light region, which promoted photogenerated charge transfer and separation. Using p-nitrophenol (p-NP) as the model pollutant, the CN-FePc-1 effectively reduced it to p-aminophenol (p-AP), with the photocatalytic reaction rate being 18 and 3 times higher, respectively, than those of the pristine gCN and the mechanically mixed photocatalyst of gCN/FePc. Moreover, excellent photocatalytic universality for other NACs, high stability, and good reusability also were confirmed. Based on the band structure of the gCN-FePc-1 photocatalyst, a plausible mechanism was proposed to illustrate the photocatalytic reduction process of p-NP to p-AP. This study demonstrates that the covalent modification of FePc into gCN skeleton is an effective strategy to modulate the electronic structure, and the hybrid gCN-FePc is a potential visible-light-driven photocatalyst that potentially can be used for eliminating NAC contamination in wastewater.

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“…Recently, polymeric carbon nitride (C 3 N 4 ) has been widely investigated as a photocatalyst. This material has excellent corrosion resistance in seawater, which is an attractive feature of photocatalysts for seawater splitting. − However, it is challenging to avoid the adverse ion adsorption and side reaction of Cl – . Recently, several approaches have been developed to enhance the photocatalytic activity of C 3 N 4 -based materials in seawater. , One point of note is the report we presented that showed the competitive inhibition of ions caused by the high water affinity of the catalysts .…”

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confidence: 91%

Hierarchically Porous Few-Layer Carbon Nitride and Its High H⁺ Selectivity for Efficient Photocatalytic Seawater Splitting

Xiao

Yin

et al. 2023

Nano Lett.

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Photocatalysts for seawater splitting are severely restricted because of the presence of multiple types of ions in seawater that cause corrosion and deactivation. As a result, new materials that promote adsorption of H+ and hinder competing adsorption of metal cations should enhance utilization of photogenerated electrons on the catalyst surface for efficient H2 production. One strategy to design advanced photocatalysts involves introduction of hierarchical porous structures that enable fast mass transfer and creation of defect sites that promote selective hydrogen ion adsorption. Herein, we used a facile calcination method to fabricate the macro–mesoporous C3N4 derivative, VN-HCN, that contains multiple nitrogen vacancies. We demonstrated that VN-HCN has enhanced corrosion resistance and elevated photocatalytic H2 production performance in seawater. Experimental results and theoretical calculations reveal that enhanced mass and carrier transfer and selective adsorption of hydrogen ions are key features of VN-HCN that lead to its high seawater splitting activity.

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A ragged porous hollow tubular carbon nitride towards boosting visible-light photocatalytic hydrogen production in water and seawater

Cited by 76 publications

References 87 publications

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C₃N₄ Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO₂

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C₃N₄ Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO₂

Covalent Modification of Iron Phthalocyanine into Skeleton of Graphitic Carbon Nitride and Its Visible-Light-Driven Photocatalytic Reduction of Nitroaromatic Compounds

Hierarchically Porous Few-Layer Carbon Nitride and Its High H⁺ Selectivity for Efficient Photocatalytic Seawater Splitting

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A ragged porous hollow tubular carbon nitride towards boosting visible-light photocatalytic hydrogen production in water and seawater

Cited by 76 publications

References 87 publications

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C3N4 Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO2

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C3N4 Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO2

Covalent Modification of Iron Phthalocyanine into Skeleton of Graphitic Carbon Nitride and Its Visible-Light-Driven Photocatalytic Reduction of Nitroaromatic Compounds

Hierarchically Porous Few-Layer Carbon Nitride and Its High H+ Selectivity for Efficient Photocatalytic Seawater Splitting

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Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C₃N₄ Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO₂

Carbon Dots Mediated In Situ Confined Growth of Bi Clusters on g‐C₃N₄ Nanomeshes for Boosting Plasma‐Assisted Photoreduction of CO₂

Hierarchically Porous Few-Layer Carbon Nitride and Its High H⁺ Selectivity for Efficient Photocatalytic Seawater Splitting